Scientists in China have unearthed a vast graveyard of eggs and bones from a newfound species of ancient flying reptiles. Their find suggests that this pterosaur probably nested in groups.

The discovery cracks open an old question about pterosaur life: Did these animals travel in flocks or fly solo?

The skeletons of these animals are fragile. That has meant that scientists rarely found intact bones. Fossil eggs are even rarer. Until now, scientists had found only four isolated, squished ones. S...